Nucleotide and deduced amino acid sequence of bovine IZUMO1. The deduced amino acid sequence is shown below the nucleotide sequence numbered in the 5′ to 3′ direction. Arrows indicate predicted boundaries of Immunoglobulin (Ig) like domain. The cysteine residues that might form a disulphide bridge are indicated by asterisks. A putative polyadenylation signal, AATAAA, is indicated by double underlines. The region of a putative transmembrane domain is underlined with solid line. CT, cytoplasmic tail.